Evaluate 3*12

Multiply ${\displaystyle 2}$ by ${\displaystyle 3}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 12}$.

Multiply ${\displaystyle 1}$ by ${\displaystyle 3}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 12}$.

Add the numbers in each column. In this case, add ${\displaystyle 6+0}$, then place the ${\displaystyle 6}$ in the result line.

Add the numbers in each column. In this case, add ${\displaystyle 0+3}$, then place the ${\displaystyle 3}$ in the result line.